Both of my dds had significant scatter on the WISC (btwn 8-19 for both of them). Dd12 does not have a learning disability, however. Her 8 score was likely due to anxiety and meticulousness. Dd10 has ADD and significant anxiety.

Dd10 has also taken the RIAS and it wasn't any better at pinpointing her ability. The scores were too disparate to calculate a composite score.

Beyond that, I really don't have any insight. Hopefully someone else will chime in here with more ideas!